Daily Report for 28th August 2019

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Measure Value (anomaly) Time Month cumul. Record High Record Low
Minimum Temperature 17.9 °C (+5.3) 23:31 14.4 °C (+1.1) 17.9 °C (+5.3), 2019 10.9 °C (-1.7), 2010
Maximum Temperature 24.6 °C (+3.1) 14:51 24.0 °C (+1.7) 27.9 °C (+6.4), 2017 18.3 °C (-3.2), 2020
Mean Temperature 20.9 °C (+4.2) 19.1 °C (+1.4) 22.0 °C, 2017 14.7 °C, 2020
Minimum Humidity 42% 15:08 50% 71%, 2016 39%, 2013
Maximum Humidity 84% 09:19 90% 94%, 2014 84%, 2009
Mean Humidity 68% 72% 85%, 2020 61%, 2017
Minimum Pressure 1014 hPa 14:48 1012 hPa 1026 hPa, 2021 1000 hPa, 2020
Maximum Pressure 1016 hPa 23:27 1018 hPa 1028 hPa, 2021 1004 hPa, 2020
Mean Pressure 1014 hPa 1015 hPa 1027 hPa, 2021 1002 hPa, 2020
Mean Wind Speed 5.4 mph (+1.4) 5.0 mph (+1.0) 7.6 mph, 2009 1.7 mph, 2013
Maximum Wind Speed 13.0 mph 15:47 13.3 mph 18.4 mph, 2009 5.9 mph, 2013
Maximum Gust 20.7 mph 16:57 21.4 mph 27.6 mph, 2009 7.6 mph, 2013
Mean Wind Direction SW
Rainfall 0.2 mm 36.8 mm (81%) 2.8 mm, 2020
Maximum Hourly Rain 0.2 mm 2.0 mm, 2020
Maximum 10-min Rain n/a 1.4, 2009
Maximum Rain Rate n/a 24, 2014
Minimum Dew Point 10.6 °C 15:08 11.4 °C 14.2 °C, 2016 6.5 °C, 2010
Maximum Dew Point 17.0 °C 00:09 15.8 °C 17.3 °C, 2016 11.0 °C, 2010
Mean Dew Point 14.5 °C 13.6 °C 15.4 °C, 2016 8.9 °C, 2010
Measure Value Time Month cumul. Record High Record Low
Night Minimum (21-09) * 18.8 °C * 06:23 14.6 °C 18.8 °C, 2019 10.9 °C, 2010
Day Maximum (09-21) 24.6 °C 14:52 24.0 °C 27.9 °C, 2017 18.3 °C, 2020
Max 10m Temp Rise 0.7 °C 10:51 0.7 °C 0.8 °C, 2021 0.3 °C, 2018
Max 1hr Temp Rise 2.6 °C 11:10 2.5 °C 2.8 °C, 2013 1.3 °C, 2014
Max 1hr Hum Rise 12% 19:09 12% 14%, 2011 4%, 2016
Max 10m Temp Fall 0.5 °C 16:54 0.7 °C 0.9 °C, 2021 0.4 °C, 2014
Max 1hr Temp Fall 1.6 °C 17:14 2.1 °C 2.6 °C, 2013 1.1 °C, 2016
Max 1hr Hum Fall 16% 11:33 12% 17%, 2017 6%, 2016
Max 10m Wind Speed 10.4 mph 19:48 10.0 mph 13.8 mph, 2016 4.2 mph, 2013
Minimum Feels-like 21.5 °C 23:25 16.8 °C 21.5 °C, 2019 11.5 °C, 2010
Maximum Feels-like 27.8 °C 12:29 27.4 °C 31.4 °C, 2017 19.7 °C, 2010
Mean Feels-like 24.6 °C 22.3 °C 25.1 °C, 2017 15.8 °C, 2010
Air-frost Hrs 0 hrs 0 hrs 0 hrs, 2009 0 hrs, 2009
Measure Value (anomaly) Month cumul. Record High Record Low
Temperature Range 6.7 °C (-2.2) 9.6 °C (+0.6) 12.7 °C (+3.8), 2017 3.3 °C (-5.6), 2016
Humidity Range 42% 40% 54%, 2013 13%, 2016
Pressure Range 2 hPa 5 hPa 10 hPa, 2015 2 hPa, 2021
Measure Value [% of max] Month cumul. Record High Record Low
Sun Hours 5 [40%]179 hrs (105%) [48%] 11 [87%], 2017 1 [8%], 2016
Wet Hours 135 hrs (102%) [5.2%] 3, 2014 0, 2011
Cloud Cover am: Overcast transitioned to Partly Cloudy
pm: Partly Cloudy transitioned to Mostly Cloudy
Events None
Comments am Shower/Rain
Extra Comments
Issues None known
Observer Absent? No
Pond Temperature (Heath) 21.0 °C
Notes
Times of extremes are computed using the midpoint of the longest continuous period at that extreme value.
Cumulative anomalies are reported according to the expected value for the month-to-date rather than month-end.
Sun hrs are initially pulled from the official weather station at Heathrow, and later adjusted by hand to reflect local conditions based on webcam observations. Wet hrs are dervied algorithmically from rainfall data, though may be adjusted manually. Cloud cover and Events are manually reported, often with multi-week delays.
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Daily Graph of Conditions

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Webcam Summary of Cloud Conditions

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